"It didn't really register," he said. "I just saw reactions about it on social networks. It is simply a harmless situation."

Despite all the social media backlash, Trump was correct to make his way to the front of the photo in the first place.

8PHOTOS

Trump appears to shove leader at NATO summit

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Trump appears to shove leader at NATO summit

L-R, Belgium's King Philippe, NATO Secretary General Jens Stoltenberg, U.S. President Donald Trump and Britain's Prime Minister Theresa May react during an aerial fly-pass at the new NATO headquarters in Brussels, Belgium, May 25, 2017. REUTERS/Christian Hartmann

U.S. President Donald Trump jokes with French President Emmanuel Macron about their handshakes in front of NATO leaders, including German Chancellor Angela Merkel, NATO Secretary General Jens Stoltenberg (2ndR) and Belgium King Philippe (L), at the start of the NATO summit at their new headquarters in Brussels, Belgium, May 25, 2017. REUTERS/Jonathan Ernst TPX IMAGES OF THE DAY

U.S. President Donald Trump (L) and Britain's Prime Minister Theresa May react during a ceremony at the new NATO headquarters before the start of a summit in Brussels, Belgium, May 25, 2017. REUTERS/Christian Hartmann TPX IMAGES OF THE DAY

U.S. President Donald Trump walks beside Croatia's President Kolinda Grabar-Kitarovic at the start of the NATO summit at their new headquarters in Brussels, Belgium, May 25, 2017. REUTERS/Jonathan Ernst

U.S. President Donald Trump (R) and Luxembourg's Prime Minister Xavier Bettel (2ndR) walk past Britain's Prime Minster Theresa May before the start of the NATO summit at their new headquarters in Brussels, Belgium, May 25, 2017. REUTERS/Kevin Coombs

U.S. President Donald Trump (R) walks past Britain's Prime Minister Theresa May (L), Canada's Prime Minister Justin Trudeau (2ndL) and other leaders at the start of the NATO summit at their new headquarters in Brussels, Belgium, May 25, 2017. REUTERS/Jonathan Ernst

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The Associated Press reports that according to the seating chart for the event, the president of the United States is supposed to be at the front of the photo -- a longstanding tradition.

Montenegro's representative was supposed to stand in the back of the photo since the country is slated to become NATO's 29th member next month.